FFMPEG scale, zoom, and concat filter

I am using ffmpeg for android to produce video with mp4 format. I'm having trouble getting this command to work in FFMPEG, basically I am trying to add two images, scale them, add zoom effect, and finally concat the result into one video file. I have done something like this :

ffmpeg -t 8 -i image1.png
-t 8 -i image2.png
-filter_complex
[0:v]scale=720:720[scl1]; [1:v]scale=720:720[scl2];
[scl1]zoompan=z=if(lte(zoom, 1.0), 1.55, max(1.001, zoom - 0.0010)):d=205, fade=t=out:st=7:d=1[v0];
[scl2]zoompan=z=if(lte(zoom, 1.0), 1.55, max(1.001, zoom - 0.0010)):d=205, fade=t=in:st=0:d=1,fade=t=out:st=7:d=1[v1];
[v0][v1]concat=n=2:v=1:a=0, format=yuv420p[v] -map [v] outputVideo.mp4

Been tinkering with this command for a while but still can't get it to work and I got error :

Input link in1:v0 parameters (size 1280x720, SAR 0:1) do not match the corresponding output link in0:v0 parameters (1280x720, SAR 45:31)
[Parsed_concat_7 @ 0xf0d77600] Failed to configure output pad on Parsed_concat_7